Furnace-door.



J. BORGE.

FURNACE DOOR.

APPLICATION FILED APR.6. 191a. RENEWED JAN. n. ma.

Patented Aug, 13, 1918.

2 SHEETS-SHEET ll. BOHGE.

FURNACE DOOR.

APPLICATION FILED APR. 6. I9l6. RENEWED JAN. 11.1910.

1,275,650. Patented Aug. 13, 1918.

2 SHEETS-SHEET 2- UNITED sTArrnsrATnn OFFICE.

JOHN BORGE, OF NEW YORK, N. Y., ASSIGNOR T0 BORGE IN'GINERATORCORPORATION,

OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.

FURNACE-DOOR.

To all whom it may con cern:

Be it known that 1, JOHN Boron, a subject of the King of Norway, and aresident of the city of New York, county of Kings, and State of NewYork, (whose post-office address is Flatiron Building, New York city,)have invented a new and useful Improvement in Furnace-Doors, of whichthe following is a specification.

The object of my invention is to provide a furnace door which containstwo parts, one covering the fire box opening, and the other the ashpitopening, and this door is so arranged and disposed that it constitutesboth a preheater and a regulator for the air supply. This and otherobjects are accomplished by my invention, one embodiment of which ishereinafter more particularly set forth.

For a more particular description of my invention, reference is to behad to the accompanying drawings, forming a part hereof, in whichaFigure 1 is a front elevation of my improved door applied to a furnace;

Figs. 2, 3 and 4 are sectional views taken on the lines 22, 3-3, and 4-4respectively of Fig. 1, looking in the direction of the arrows; and

Fig. 5 is a sectional perspective view of a furnace provided with myimproved door.

Throughout the various views of the drawings, similar referencecharacters designate similar parts.

My improved door 1 is composed of an upper section 2 opposite the firebox 3 and a lower section 4 opposite the ashpit 5, and these sectionsare hinged at one side to the sectional pillar 6 by means of suitablehinges 7. A second sectional pillar 8 is placed beside the door 1 and onthe side opposite to the hinged side. Each of the pillars 6 and 8 ishollow, open at the top and provided with a side opening 20 near thebottom which connects with the ashpit. To regulate, hinged covers 6 and8 respectively are placed over the tops of these pillars.

The sections 2 and 4 are so made that the upper overlaps the lower, sothat when the lower door is opened, both. doors will be opened for apurpose that will appear below. The upper door may be-opened independently of the lower door and to facilitate this opening, a handle 9is provided. The lower door has a corresponding handle 10.

Specification of Letters Patent Patented Aug, 13, 19155, Applicationfiled April 6, 1916, Serial No. 99 ,297.

Renewed January 11, 1918. Serial No. 211,453.

The upper section 2 is provided with a front plate 11 which is spacedfrom a rear plate 12 by suitable stay bolts 13, or other suitable means,thus forming an air passage between said plates. Rods 14 are mounted toturn between the front and rear plates,

and said rods carry dampers 15, which may be swung so as to permit moreor less air to flow between the front 11 and rear plate 12, as shown. Ifdesired, they may be thrown so as to shut off practically all air. Asshown in Fig. 3, the frontll is also con nected to the rear plate 12 bymeans of the end walls 16, and it will be understood that there is noclosing either at the top or bottom of the front wall 11, so that airmay rush freely in a vertical and downward direction between the parts11 and 12 to the extent permitted by the dampers 15.

The lower section 4 differs from the section 2 in that it has no rearplate, and no dampers and no stay bolts. It has a bottom 17 which isconnected to sides 18 and a front 19, as shown. The door 1 is fitted soas to form an air-tight joint, or a substantially air-tight joint withboth the opening to the ashpit and the opening to the fire box, exceptin so far as shown, through the air passage formed as above described.

In view of the foregoing, the operation of my improved door will bereadily understood. Assuming the parts to be as shown, the dampers 15are more or less opened by turning the rods 14 to the desired extent,and air will then pass as indicated by the arrows in Fig. 5, between therear plate 12 and front 11, of the upper section 2 and thence downwardlyby the stay bolts 13 to the chamber formed in the lower section 4, andthence into the ashpit 5 and up through the grate 20 to the fire, in theconventional manner. i

It will be noted that the construction herein shown and describedprevents an overheating of the rear plate 12, and that the air enteringthrough the door, as above described, is preheated through this rearplate 12, and the overlapping of the sections 2 and 4 prevents anopening of the section 4 without opening the section 2, and so preventsthe rear plate 12 from getting burnt when the ashes are cleaned out. Theair entering through the pillars 6 and 8 will also be preheated to alesser extent.

"While I have shown and described one embodiment of my invention, it isobvious that it is not restricted thereto, but is broad enough to coverall structures that come Within the scope of the annexed claim.

What I claim is: .s

In a device of the class described, a furnaee having ash pit and firebox openings, at door in two sections, the upper section covering thefire box o ening, the lower section covering the ash pit opening, andtheupper s ction overla ping the lower section, a rear plate secured to theupper section and spaced therefrom to form an air passage between saidupper section of the door and said rear plate, means for regulating theair flow through said passage, said air passage being open to theatmosphere at its upper end and JOHN B'ORGE.

Copies of this eaten may be obtained for five cents eaeh, jay addressingthe "commissioner of ratenn. Washington, a. c."

